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Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Inference of Multisite Phosphorylation Rate Constants and Their Modulation by Pathogenic Mutations.

Eyan Yeung1, Sarah McFann2, Lewis Marsh3

  • 1Lewis-Sigler Institute for Integrative Genomics, Princeton University, Carl Icahn Laboratory, Washington Road, Princeton, NJ 08544, USA; Department of Molecular Biology, Princeton University, Lewis Thomas Laboratory, Washington Road, Princeton, NJ 08544, USA.

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|February 16, 2020
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Summary
This summary is machine-generated.

Understanding dual phosphorylation kinetics is key to cell regulation. This study reveals how mutations in MEK affect ERK dual phosphorylation, impacting enzyme efficiency and disease mechanisms.

Keywords:
Bayesian parameter inferenceERKMAPK pathwayMEKkinasekinetic parametersmultisite protein phosphorylationpathogenic mutationsphosphorylationstructurally identifiable kinetic model

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Area of Science:

  • Cellular signaling
  • Biochemistry
  • Enzyme kinetics

Background:

  • Multisite protein phosphorylation is crucial for cellular regulation.
  • The kinetics and order of phosphorylation steps are vital for function but poorly understood.
  • Dual phosphorylation, specifically of ERK, serves as a model for these complex processes.

Purpose of the Study:

  • To investigate the kinetic mechanisms of dual phosphorylation of ERK by MEK.
  • To analyze the impact of pathogenic mutations on enzyme processivity and phosphorylation efficiency.
  • To establish a framework connecting mutations to kinetic parameters for multisite phosphorylation.

Main Methods:

  • Utilized Bayesian parameter inference.
  • Employed a structurally identifiable kinetic model.
  • Focused on the dual phosphorylation of ERK by MEK.

Main Results:

  • Dissected the kinetic parameters governing dual phosphorylation of ERK.
  • Quantified how enzyme processivity and phosphorylation step efficiencies are altered by mutations.
  • Identified specific kinetic changes associated with pathogenic mutations in MEK.

Conclusions:

  • The study provides a systematic framework to link enzyme kinetics to multisite phosphorylation mechanisms.
  • Understanding these kinetics is essential for bridging in vitro enzyme studies with in vivo biological effects.
  • This approach offers insights into disease mechanisms driven by mutations in kinases like MEK.